Re: LENOVO BIOS AUTO-PATCHER for Supervisor Password Removal

Hi, has anyone tested this on Lenovo E540? I got one with faulty motherboard and i found good deal on otherwise working motherboard with supervisor password.

Also can you use arduino as spi programmer? I did reprogram some soic 8 chips with it back in the day, but they were I2C and not SPI.

Re: Powermac G5 late 2005 power supply troubleshooting



I could never measure resistance bigger than literally dead short.

The short was on the pads of the board between G and S pins of the MOSFET. MOSFET itself is fine and measured in my LCR tester as N MOSFET...

Re: Powermac G5 late 2005 power supply troubleshooting

I found two IGBTs (20n60c3) that have extremely low resistance between gate and emitter pins. After desoldering one, the igbt is perfectly fine and short remains. Is that normal? Also my transistor tester labels it as N MOSFET and i also found datasheets for 20n60c3 where it's labeled as mosfet and not igbt. If that's true, gate and source are shorted out.

I found even weirder thing. None of the transformers have any expected resistance of their windings
When i measure two pins, i either measure dead short...

Note to mods: please remove the first thread i posted. It had crappy title. Hopefully this will make some powermac expert look at it more likely

So i bought PowerMac G5, which worked for around an hour. Then i decided to partially strip it down and re-paste CPU, after which it still worked. However just after i added DDR2 memory into it and connected it to 220v, the mac made a loud pop noise, diagnostic leds on the front side of motherboard shortly blinked and since then, the power mac has no signs of life at all

PSU is API4fS13. There is no visibly broken component...

Re: New Members - please post your introductions here

Hi, i am interested in getting help with solving an issue with Powermac G5 Late 2005 power supply